What exactly do you mean by this? Do you mean the aimer-thingy-thing-in-the-middle-of-your-screen (reticle)?
If you don't know why it's not working perhaps you should consult the sticky threads for more help.
Edit: consult GenericUsername's guide on making reticles somewhere in the modification forum...
By the hitmarker, I mean the alternate reticle that appears when you hit somebody, so that you know you hit them. Usually, the default reticle flashes red.
I saw GenericUsername's and its not helping with this.